API to identify host objects
rfobic at gmail.com
Mon Nov 12 14:12:02 PST 2012
Lately I have being struggling with an implementation differences of host (DOM) objects across the browsers.
So far only reliable way I could find to identify host objects is by a following assertion:
object.constructor.call === void(0)
Behaviour seems to be consistent across FF, Opera, Safari, and Chrome (Don't have windows to test on IE).
I think it would be great if there was some standardised way to identify host objects.
My personal use case is polymorphic method dispatch library https://github.com/Gozala/method that has same semantics as
clojure protocols. Method implementations for host objects and built-ins are stored in the separate dictionary to avoid memory leaks and to support objects from diff JS contexts / frames / compartments.
If you know of a better of identifying host objects I would really love to know that too.
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